Chocolate Sandwich Cookies

For the Cookies:

1 1/2 cups All-purpose Flour
1/4 cup Unsweetened Cocoa Powder
1 tsp. Baking Soda
1/4 tsp. Salt
1 stick (1/2 cup) Unsalted Butter, softened
3/4 cup Brown Sugar
1 cup Sugar
1 Egg
1 tbsp. Milk
3 tsp. Vanilla Extract
1/2 cup Chips of your choice (I used mostly white chips, with a few mini chocolate ones)

in a large bowl, mix the Flour, Cocoa Powder, Baking Soda and Salt.
In a separate bowl, use a fork or mixer to ‘smoosh’ the softened Butter, Brown Sugar and Sugar until it’s well-mixed. Add the Egg, Milk and Vanilla and mix well. 
Add the flour mixture to the butter mixture and mix until a soft dough is formed. Stir in the chips.
Use aluminum foil or plastic wrap to cover the dough and chill for at least 1-2 hours.
When ready, preheat the oven to 350 Degrees F. Line or spray two baking sheets.
Spoon the dough in 1″ balls and place on baking sheets.
Bake for 10-12 minutes. DO NOT OVERBAKE, or they won’t be soft and moist.
Allow them to cool on the baking sheet for 5 minutes, then transfer them to a wire rack to finish cooling.

Frosting
2 boxes (16 oz.) Cream Cheese, softened
2 sticks (1 cup) Unsalted Butter, softened
8 cups Powdered Sugar
2 tsp. Vanilla Extract

In a bowl, mix the Cream Cheese and Butter until well-combined.
One cup at a time, add the Powdered Sugar and mix until smooth.
Add the Vanilla and fully combined. Spread on cookies, and enjoy!